Astronomy - 9th Grade

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Across
  1. 2. Which planet has the smallest mass in solar system
  2. 4. Object whose gravity is so strong that not even light cannot escape
  3. 6. Planet with maximum no of moons
  4. 8. distance from stars are usually expressed in units called?
  5. 10. Brightest and hottest planet in solar system
Down
  1. 1. Which is the most common element found in stars
  2. 3. Earth's movement around the sun is called?
  3. 5. First dog into the space and in orbit of earth
  4. 7. which planet is called as Red planet
  5. 9. What is the force that tends to pull together the matter in stars and planets